For the majority of children, after three months of life, you can hold them vertically, because children within three months do not lift their heads or are not particularly stable, so holding them vertically at this time will cause significant pressure on the neck muscles, which will damage the children’s neck muscles and outweigh the losses. After three months of age, the neck muscles have developed to maturity, the child’s head is more stable, the spine has formed a neck bend, head and eye coordination is also good, at this time you can hold the child upright normally. However, when holding a three-month-old child vertically, it is necessary to use a hand to support the neck at first to prevent damage to the child’s neck.